Upgrade stemcell to 3445.11
Upgrade stemcell to 3445.11

[#150988439]

Signed-off-by: Morena De Liddo <cc458fcb8f9397dded2420efcbc3b8e39e6c286c@pivotal.io>

pivotal-cf-experimental/kubo-deployment,pivotal-cf-experimental/kubo-deployment,jaimegag/kubo-deployment,jaimegag/kubo-deployment